Are these UUIDs cryptographically random?

Yes. The generator uses the Web Crypto API (crypto.randomUUID) when available, which provides cryptographically strong random values.

Can I use these in production?

Yes. UUID v4 is widely used for primary keys, request IDs, and distributed systems. They are safe to use in production.

Runs in browser

Generate cryptographically random UUID v4 identifiers instantly.

Generate cryptographically random UUID v4 identifiers instantly in your browser. Bulk generation supported. Free and private.

Version

Format

Generated UUID (V4)

Bulk generation (1–100)

🔒 Runs in your browser · No uploads · Your data never leaves your device

Generate a UUID
The tool shows one UUID by default. Click Regenerate to create a new one.
Copy to clipboard
Use the Copy button to copy the current UUID for use in your code or database.

Generating IDs for database records — Create UUIDs to use as primary keys for new database rows before inserting them.
Creating test fixtures — Generate multiple UUIDs for seeding test data or mocking API responses during development.
Building distributed systems — Use UUID v4 to generate collision-resistant IDs for events, messages, or resources in distributed architectures.

Are these UUIDs cryptographically random?: Yes. The generator uses the Web Crypto API (crypto.randomUUID) when available, which provides cryptographically strong random values.
Can I use these in production?: Yes. UUID v4 is widely used for primary keys, request IDs, and distributed systems. They are safe to use in production.

UUID: Universally Unique Identifier — a 128-bit value formatted as 8-4-4-4-12 hexadecimal characters, used as a unique ID.
UUID v4: A randomly generated UUID with 122 bits of randomness — the most commonly used version.
GUID: Globally Unique Identifier — Microsoft's name for UUID, functionally identical.

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